Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd5950a473cc9cc…

MALICIOUS

PDF

84.7 KB Created: 2020-12-23 23:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d36a0fa8cb103fa2838c8a7f6e2eb3a2 SHA-1: bcc599e55d4a5423de970b79112bc2ce25e551b4 SHA-256: efd5950a473cc9cce87cf18a5ab8613d58b9deb2014a001be3a4d4898f3f4ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed a PDF link farm containing numerous external links, with one prominent URL being `https://trafficel.ru/strik?utm_term=old+orange+video+game+character`. This suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/strik?utm_term=old+orange+video+game+character PDF link annotation
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/sojifowazesegu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/idTvhbc/emoneyusa_contact_number.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/a0139699d.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/2b26b16c4a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f90c3825c822.pdfIn PDF document text
    • https://cdn.sqhk.co/sekeniti/JkhaUnE/authorised_push_payment_fraud_compensation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_5f94927217331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a39344-e8a6-406e-8310-6cb2f849a806/60665918566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9e2398-e8f7-4b7f-87e8-7eb088a0260e/zavuselasawaribivokar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574f33a6-caed-4a7d-9d24-5c3dddd40b67/on_the_contrary_definition_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbf5054-440c-49dc-b2b0-7ab61d775e2a/16414920295.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 5260 bytes
SHA-256: 2fd748ec22761d85f0eaf9828e87d57c24cef096efd7565a5b807838e5c4dda3
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 10588 bytes
SHA-256: acd5a521e03c5708f70ef10a0f643e5bb13dbc8dba4e80a16f819b4c01ed6b50

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